• Background Information. 141Thomas de Clare, had a public career and was a friend of Prince Edward, with whom he went on a Crusade. In July 1257 and later he and his brother Bevis or Benet were allowed oaks from the forest of Shotover for their fuel at Oxford. Thomas was knighted by Simon de Montfort, before Lewes, and in Apr 1265 the castle of St. Briavel's was given into his charge. He died in Ireland Feb 1287/8, leaving a son and heir Thomas, and a son Richard, a clerk.

~Cokayne's Complete Peerage, 2nd Edition, (Hertford), Vol. V. p. 701

From Some Corrections and Additions to Complete Peerage: Volume III, pp. 246-247:
"Thomas de Clare was a younger son of Richard de Clare, Earl of Gloucester and Hertford (d. 1262)."

Thomas married Juliane Fitz Maurice, daughter of Sir Maurice Fitz Gerald Lord of Offaly, Judiciar of Ireland and Maud de Prendergast, in 1275 in England.160 (Juliane Fitz Maurice was born about 1262 in Dublin, Ireland and died before 24 Sep 1300.)